Archive for the ‘rechargeable’ Category:

2019-01-07 TRF Receiver Experiment

2018-01-04 also FB group Building Transistor Radios I thought that the ‘tinkerers’ who were tinkering with the loop antennas may have been getting a stronger signal because the loop antennas have a large area to capture the RF signals, so I decided to make a single channel AM Band receiver, and I chose KNX 1070

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2015-11-28 Recharging From Used Alkalines

I have often seen schematics of Joule Thief chargers for use in charging Ni-MH rechargeables from used alkaline cells.  The idea is to boost the voltage of the used alkaline cell up to high enough to get current the flow into the Ni-MH cell.  One setback is that conventional JTs are only 50% efficient, so

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2015-02-06 Ravpower Power Bank Charger

I ordered five of the Ravpower RP-PB08 portable chargers and after I got them and showed them to my friends, they suddenly remarked that they needed one of them.  So my five have suddenly dwindled to just a few left and those may disappear, too. These are rated at 3200 mAh.  That’s just a bit

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2014-12-09 Power Bank Recharges USB Devices

I have been working on my own “Power Bank” for recharging my cell phone.  I went to the NOCCC Computer Club meeting last Sunday and to the Mobile Computing meeting.  Ben, who started this meeting, decided that he wanted to buy some ‘power bank’ USB chargers for himself, family and friends.  He could’ve got then

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2014-10-07 Fast Charging From Car’s 12V Socket

Earlier this year I bought a cheap cell phone charger for plugging into the car’s cigarette lighter socket.  It works, but it’s s-l-o-w.  I can drive for a half hour with the cell phone plugged in and it says it’s charging but it only charges a few percent.  As a result, I don’t use the

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2013-12-09 Triple Win With New TV

I won three ways on  cyber Monday when I went to Costco and bought a new 39 inch Samsung TV.  It’s a lot lighter than the old 32 inch I have. First, I already have a 32 inch Samsung, so it’s much the same as this TV.The remote buttons are not the same, but similar.

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